linux-kernel - 2.6.29.5: Oops when unplugging Moschip 7840/7820 USB serial device

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Date:	Thu, 09 Jul 2009 13:56:49 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Stern <stern@...land.harvard.edu>,
	Tony Cook <tony-cook@...pond.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-usb-devel@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 2.6.29.5: Oops when unplugging Moschip 7840/7820 USB serial device

I unplugged a Moschip 7840/7820 USB serial adapter, and it oopsed.  I had been using it
with picoterm, but it was not open at the time I unplugged it.

Thanks,
	J

BUG: unable to handle kernel NULL pointer dereference at 00000000000000b4
IP: [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
PGD 12e19c067 PUD 12e19d067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq
CPU 0 
Modules linked in: mos7840 usbserial joydev aes_x86_64 aes_generic hidp fuse ipt_MASQUERADE iptable_nat nf_nat rfcomm bridge stp llc bnep sco l2cap coretemp sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq freq_table dm_multipath kvm_intel kvm uinput snd_hda_codec_conexant snd_hda_intel snd_hda_codec arc4 ecb snd_hwdep thinkpad_acpi iwlagn usb_storage snd_pcm hwmon btusb e1000e pcspkr iwlcore snd_timer iTCO_wdt lib80211 iTCO_vendor_support mac80211 i2c_i801 wmi snd bluetooth cfg80211 soundcore snd_page_alloc i915 drm i2c_algo_bit i2c_core video output [last unloaded: microcode]
Pid: 27, comm: khubd Not tainted 2.6.29.5-191.fc11.x86_64 #1 74542GU
RIP: 0010:[<ffffffff81029eb5>]  [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
RSP: 0018:ffff88013a413ba0  EFLAGS: 00010046
RAX: 0000000000000100 RBX: 00000000000000b4 RCX: 000000000010000f
RDX: ffff88013a413af0 RSI: 0000000000000203 RDI: 00000000000000b4
RBP: ffff88013a413ba0 R08: ffffffff815fcf28 R09: ffff880073f51c00
R10: 0000000000000003 R11: ffff88013a438818 R12: 0000000000000203
R13: ffff880073f51c10 R14: 0000000000000002 R15: 00000000000000b4
FS:  0000000000000000(0000) GS:ffffffff817b7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00000000000000b4 CR3: 000000012e199000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process khubd (pid: 27, threadinfo ffff88013a412000, task ffff88013a40ae00)
Stack:
 ffff88013a413bb0 ffffffff81029f7f ffff88013a413bd0 ffffffff813abf94
 ffff880073f51c00 0000000000000000 ffff88013a413c10 ffffffffa0399afa
 ffff88013a413c10 ffff880073f51c00 ffff880119898800 0000000000000000
Call Trace:
 [<ffffffff81029f7f>] default_spin_lock_flags+0x9/0xe
 [<ffffffff813abf94>] _spin_lock_irqsave+0x32/0x3b
 [<ffffffffa0399afa>] mos7840_shutdown+0x93/0x120 [mos7840]
 [<ffffffffa038de76>] usb_serial_disconnect+0xe9/0x152 [usbserial]
 [<ffffffff812a3d56>] usb_unbind_interface+0x6e/0xec
 [<ffffffff8125375f>] __device_release_driver+0x68/0x89
 [<ffffffff8125386f>] device_release_driver+0x26/0x33
 [<ffffffff81252de1>] bus_remove_device+0xa4/0xb9
 [<ffffffff8125165d>] device_del+0x135/0x189
 [<ffffffff812a135c>] usb_disable_device+0x96/0x10d
 [<ffffffff8129ce29>] usb_disconnect+0xa1/0x124
 [<ffffffff8129dc12>] hub_thread+0x4e1/0xe8f
 [<ffffffff8105c8d7>] ? autoremove_wake_function+0x0/0x39
 [<ffffffff8129d731>] ? hub_thread+0x0/0xe8f
 [<ffffffff8105c541>] kthread+0x4d/0x78
 [<ffffffff8101264a>] child_rip+0xa/0x20
 [<ffffffff81011f67>] ? restore_args+0x0/0x30
 [<ffffffff8105c4f4>] ? kthread+0x0/0x78
 [<ffffffff81012640>] ? child_rip+0x0/0x20
Code: 9c 02 81 44 89 c6 48 89 c7 e8 0a fb ff ff eb 0f 0f b7 f6 40 0f b6 ff 48 89 c2 e8 1c fb ff ff c9 c3 90 55 b8 00 01 00 00 48 89 e5 <f0> 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6 c9 c3 55 48 89 e5 
RIP  [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
 RSP <ffff88013a413ba0>
CR2: 00000000000000b4
---[ end trace 8b6fd3d1bbb45aa9 ]---


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